Added VPN GW and Tunnel modules.

modules/cloud-vpn-tunnel/main.tf

@@ -0,0 +1,31 @@
+data "google_compute_vpn_gateway" "gw" {
+  name = var.gw_name
+}
+
+locals {
+  vpc_name = regex("networks/([^/]+)$", data.google_compute_vpn_gateway.gw.network)[0]
+}
+
+data google_compute_network network {
+  name = local.vpc_name
+}
+
+resource "google_compute_vpn_tunnel" "tunnel" {
+  name               = var.name
+  target_vpn_gateway = data.google_compute_vpn_gateway.gw.id
+
+  shared_secret = var.shared_secret
+  peer_ip       = var.peer_ip
+  ike_version   = 2
+
+  local_traffic_selector  = concat(var.local_selectors, ["35.199.192.0/19"])
+  remote_traffic_selector = var.remote_selectors
+}
+
+resource "google_compute_route" "route_to_remote_network" {
+  count               = length(var.remote_selectors)
+  name                = "${data.google_compute_network.network.name}-to-${replace(var.remote_selectors[count.index], "/[./]/", "-")}"
+  network             = data.google_compute_network.network.name
+  dest_range          = var.remote_selectors[count.index]
+  next_hop_vpn_tunnel = google_compute_vpn_tunnel.tunnel.id
+}

modules/cloud-vpn-tunnel/variables.tf

@@ -0,0 +1,30 @@
+variable "name" {
+  description = "Name of the VPN tunnel"
+  type        = string
+}
+
+variable "gw_name" {
+  description = "The name of the VPN gateway"
+  type        = string
+}
+
+variable "shared_secret" {
+  description = "Shared secret for the VPN tunnel"
+  type        = string
+  sensitive   = true
+}
+
+variable "peer_ip" {
+  description = "IP address of the peer VPN gateway"
+  type        = string
+}
+
+variable "local_selectors" {
+  description = "Local traffic selectors for the VPN tunnel"
+  type        = list(string)
+}
+
+variable "remote_selectors" {
+  description = "Remote traffic selectors for the VPN tunnel"
+  type        = list(string)
+}